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Updated: May 19, 2025
If these are bred inter se, there are, as in ordinary Mendelian cases, three red-eyed to one white-eyed in the F2 generation, but white eyes occur only in the males, in other wards half the males are white-eyed. On the other hand, when a white-eyed female is mated to a red-eyed male all the daughters have red eyes, and all the sons white eyes. This has been termed crisscross inheritance.
It is impossible to conceive a single quality or factor which at different times produces directly opposite effects. The Mendelian theory is merely a theory in words, which have an apparent relation to the facts, but which when examined do not correspond to any real conceptions. However, we have to consider a number of remarkable facts concerning the relation of chromosomes to sex.
The fact that castration does affect, in many cases very profoundly, somatic characters confined to one sex, proves that Mendelian conceptions, however true up to a certain point, are by no means the whole truth about heredity and development. For it is the essence of Mendelism as of Weismannism that not only sex but all other congenital characters are determined in the fertilised ovum or zygote.
Since his day they have been re-discovered or rather re-named by a host of students, including Haeckel, Weismann, and many of scarcely less distinction. The Mendelian "factors," as I maintain must be clear to any student of the idea, are Spencer's physiological units.
It's a long, long way to the day of a segregating out and in of Mendelian unit-characters. Besides, this is a strange world of choices. Nobody is to be considered worthy of parenthood until he has fallen in love properly. Nobody who would permit an outsider's decision as to when he was properly in love would be worth thirty cents as a parent.
One old wrapper I discovered the other day runs: Weekly Magazine of Art, Philosophy, Science and Belles Lettres. A Hitherto Unpublished Letter from Walter Pater. Charlotte Bronte's Maternal Great Aunt. A New Catholic History of England. The Genius of Shakespeare. Correspondence: The Mendelian Hypothesis; The Split Infinitive; "Commence," or "Begin;" Claverhouse; Socialism and the
The soma with its male and female somatic characters has nothing to do with the question, since somatic sex-differences may be altogether wanting, and moreover, the essential male character, the formation of spermatozoa, is by the Mendelian hypothesis due to descent of the male gametes from the original fertilised or unfertilised ovum.
But Mendel's Law has far greater definiteness, it explains more accurately the cases of alternative inheritance, and it may be shown to hold for blended and mosaic inheritance as well. De Vries's new "mutation theory" is clearly not an alternative but a complementary theory to natural selection, the Weismannian and Mendelian theories.
In the case of Burroughs, it is perhaps a little worse, for the other side of his ancestry is not free from the taint of alcoholism." "And Edith Atherton?" "The same way. They both carry it. I won't go into the Mendelian law on the subject. We are clearing up much that is obscure. But as to Burroughs, he should marry, if at all, some one without that particular taint.
It is somewhat surprising that Mendelian experts, who seem to believe that species are distinguished by Mendelian characters, have not made systematic experiments on the crossing of species in order to prove or disprove their belief. For my own part I cannot help thinking that the origin of varieties in species in a domesticated or cultivated state is in a sense pathological.
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